Does anyone of you know?
The video below shows an interesting simulation of high altitude stall.
Stall begins at 1:30, then trim wheels freeze, for g <0.5...
Now look at 2:15, while the aeroplane increases speed, the trim wheels start to roll back
, then finally at 2:32, trim wheels spin forward and the aeroplane exits stall in about 10 seconds.
https://youtu.be/Tyg_qFbnnUU?t=85